nexus-yum-isolated-test

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Purpose

Many companies/organizations lock down server's access to the internet. This simple project allows testing of centos configuration for yum pointing to nexus as a proxy. Verifies that centos is limited to only communicate to nexus repo. Thus allows yum.repos.d modification to be tested.

Overview

Takes Sonatype 3.9.0 docker image and a stand alone centos docker image. Creates 2 networks one has internet access and the other does not. The centos image is attached to "no-internet" network while the nexus image can communicate on both "internet" and "no-internet" network

This was created based on the document offered by sonatype. https://help.sonatype.com/repomanager3/yum-repositories

Run

Step 1 - clone

git clone https://github.com/doughoke/nexus-yum-isolated-test.git

Now go to the new directory and docker compose up.

cd nexus-yum-isolated-test
docker-compose up

Step 2 - configure nexus yum proxy

The nexus repo should be running on http://localhost:8081

Login with: admin/admin123

Create Repository (select yum proxy)

Name the repo yum-centos

Set up your yum repo to point http://mirror.centos.org/centos/ (or whatever repo mirror you want)

Step 3 - point isolated centos to nexus yum repo

ssh into the centos container

docker exec -it centos-no-internet /bin/bash

Once inside the container cd to /etc/yum.repos.d Back up existing .repo files 'mv *repo /tmp' Create a new repo file pointing to nexus (note use the sha of the nexus container - (get that from 'docker ps -a | grep nexus') Use the sample-nexus.repo file in the projet and replace string with instance id from the previous command. Save the .repo file

Step 4 - test it out

yum update
yum install zip
yum install docker ###fun to run docker in docker container